{...}: {
  # X server and window manager
  services.xserver = {
    enable = true;
    windowManager.i3.enable = true;

    # Czech QWERTZ layout
    xkb = {
      layout = "cz";
      options = "eurosign:e,caps:escape";
    };
  };

  # Compositor (system-level service)
  services.picom.enable = true;
}